sharedrop/server.js

// TODO:
// - require process.env.SECRET

// Room server
var http = require('http'),
    util = require('util'),
    express = require('express'),
    uuid = require('node-uuid'),
    crypto = require('crypto'),
    extend = require('deep-extend'),
    app = express(),
    host = process.env.HOST,
    port = process.env.PORT,
    webPort = process.env.WEB_PORT, // 80 or 443
    secret = process.env.SECRET,
    server, io;

app.use(express.urlencoded());
app.use(express.cookieParser());
app.use(express.session({
    secret: secret
}));
app.use(express.compress());
app.use(express.json());
app.use('/js', express.static(__dirname + '/js'));
app.use('/css', express.static(__dirname + '/css'));

//
// Web server
//

// Handle Persona authentication
require('express-persona')(app, {
  audience: 'http://' + host + ':' + webPort
});

app.get('/', function (req, res) {
    res.sendfile(__dirname + '/index.html');
});

app.get('/room', function (req, res) {
    var ip = req.headers['x-forwarded-for'] || req.ip,
        name = crypto.createHmac('md5', secret).update(ip).digest('hex');

    res.json({
        name: name,
        uuid: uuid.v1(),
        public_ip: ip
    });
});

//
// Room server
//
server = http.createServer(app);
io = require('socket.io').listen(server);

io.sockets.on('connection', function (client) {

    // When a peer joins a room, send back list of other peers already there
    client.on('join', function (data) {
        var room = data.room,
            peer = data.peer;

        console.log('on:join', data);
        client.peer = peer;

        var clients = io.sockets.clients(room),
            peers = clients.map(function (client) {return client.peer;});

        // Send back list of other peers in the room
        client.emit('user_list', peers);

        // Join the room
        client.join(room);

        // Notify other peers that a new peer has joined the room
        client.broadcast.to(room).emit('user_added', client.peer);

        // Notify other peers when a peer leaves the room
        client.on('disconnect', function () {
            client.broadcast.to(room).emit('user_removed', client.peer);
        });

        console.log('on:join', peers);
    });

    client.on('update', function (data) {
        var room = data.room,
            peer = data.peer;

        extend(client.peer, peer);

        client.broadcast.to(room).emit('user_changed', client.peer);
    });
});

server.listen(port);